Sony DPT-RP1 Help Manual page 109

Delete the paring information and pair again.
Up to four computers can be connected. If you want to
connect to the fifth computer, disconnect an unnecessary
connection.
The Digital Paper is separated too far from the wireless
router. Move the Digital Paper closer to the computer.
The connection may be weakened by obstacles such as
walls, metal, and concrete between the Digital Paper and the
computer. Move the Digital Paper to a different location.
The Digital Paper may be experiencing signal interference
from nearby wireless devices (a cordless phone, microwave,
Bluetooth device, wireless device etc.) using the 2.4 GHz
frequency band. Turn off the wireless function of those
devices, or move the Digital Paper to a different location.
When the Digital Paper is initialized, the pairing information
is also deleted. After deleting the pairing information of your
computer, perform Bluetooth pairing again.
Related Topic
Changing the Digital Paper settings using the Digital
Paper App
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